Download these files from OOTP Mods
Historical Uniforms
https://ootpmods.com//tiki-download_...hp?fileId=3306
Historical Ballcaps
https://ootpmods.com//tiki-download_...hp?fileId=3308
Historical Logos
https://ootpmods.com//tiki-download_...hp?fileId=3307
extract these files into your Uniforms, Ballcaps, and Logos folders which should all be found in Documents->Out Of The Park Developments->OOTP Baseball 18
then go to Team Settings, and press the Modify Team Colors, Logos, and Textures button.
then for each Jersey and ballcap press "select", do a search for Expos, and pick out which uniform and ballcap you want. do the same thing for your Logo.
once you've got that down, you can go and download some fictional uniform/ballcap/logo packs and find something for the Kansas City Outlaws. Or you could make them the St Louis Browns or something and use some historical logos/unis.